Plunger hydraulic elevator.



LARSSON.

PLUNGER HYDRAULIC BLEVATOB..

/APPLIOATION FILED AUG. 1| 1904. BENEWED DBO. 16, 1909.

Patented July 12, 1910.

z SHEETS-SHEET 1.

T. LARssoN. PLUNGER HYDRAULIC ELEVATOR. APPLIOATIONTILBD AUG. 1, 1904.BENEWBD DEO. 16 1909.

Patented July 12,1910.

2 SHEETS-SHEET Z.

a M y www f A` UNITED STATES PATET THURE nAnssoN, orv WORCESTER,MASSACHUSETTS, AssIeNon To HIMSELF, FRED a.

I that type of l.hydraulic.elevators which ,are

JONES, 0F WORCESTER, MASSACHUSETTS, .ANDY-WILLIAM EaI).

YORK, N. Y.

PLUNGER HYDRAULIC ELEvaTon. l

Specification of Letters Patent.

STOKES, OF- NEW Patenten July i2, Taio.

Application i1ed"August l, 19,04, Serial No. 219,!38. Renewed December16,1909. SerialvNo. 533,397.

To all .whom it .may concern:

Be A itknown that I, v THURE Larsson, a subject of the King of Sweden,residing at Worcester, in the' county of Worcester and State ofMassachusetts, have invented a new 4andl useful Plunger HydraulicElevator, of

which the followmg is a specification.

Theobject of this invention is to improve own as plunger hydraulicelevators.' This type'of elevator consists of a travel of the elevatorcar,

` smaller` diameter to the top of the cylindelj By admitting`water.,under pressure into the cylinder the ram or plunger isejected/or lifted to raise `the car,and by allowing water to flow from'l inder allowing the y than-'the internal diameter vof lower end of thethe stulling box. proved advantageous,

the cylinder the plunger descends in the cyl car to 'come down. .Inyanelevator ofthis class .-ithas been found desirable to provide theplungerat'its lower end with guiding'means to engage the inside of thecylinder .to prevent the end of the plunger from scraping or wearing onthe cylinder in casethe mechanism is out` of line and to prevent theplunger from vibrating `or swaying in its movements. This guiding means,of course," has to be of a vsize to fit or approximately to fit totheinside of the cylinder and henceis larger the stuliing box. I The use ofsuch guiding mechanismhas introduced a factor of control isv lost ofthe'plunger on its upward movement and if-the plunger runs beyond its normallimit of upward -travel the guiding means will be broughtviolentlyagainst the stutlng box which will tend to break and destroythe same. To overcome this ditiiculty, it has been proposed to providethe lplunger'with a resilient guiding-means so that the end of theplunger with the guiding means attached thereto can beinserted int-o orejected 'out through While `this device has it is open to severalobjections, among which may be noted thatl a resilient guiding mechanismdoesnot affordy as laccurate, a working device as one i to wear andthecylinder usually.` sunk into the ground the distance of fitting intowhichl danger, in that if lent mechanism;

the-same will be thrown out of the stutiin'g box'and this ejection maytake place with considerable speed, whereby the plunger, bas soon asits' Amomentum is overcome, may drop back on top of the stufling box orlaterally clear of the stuffing box and cause a serious accident.- Toovercome these dithculties, the mechanism shown and described in thisapplication has been devised.

The mechanism consists in providing a guiding mechanism whichv cannotescape through the stuiiing box and in so arranging the parts that whenthe plunger exceeds its normal upward travel the working part 0ftheplunger will move out of the stutling box and allow the water toescape to stop the upward movement of the plunger, whereby a relief isobtained without allowing the` plunger to escape from the control of itsguidlng mechanism or to jump laterally sott' of the stufhng box.

The preferred form of device consists essentially o ffa guiding meansVseparably or yieldingly connectedy with the lower end of the plunger bya reduced connection. This guiding means is preferably made nonresilientso as' to work accurate y underfall conditions. The connection betweenthe guiding means and the plunger is preferably made to have a springvtension so thatfthe guiding means will normally tend to take -its placeat the end of the plunger. arrangement,

if derangement should take place and the plunger exceed its upward limit,of travel, the separable guiding means will engage the stuffing box, asthe plunger continues its upward movement, the yielding connection willallowthe plunger to escape from the top of the stutling box. The en`gagementofthe guiding means with the With this stuffing box thus will bean easy one without putting a heavy blow thereon. So' soon as theplungerv escapes from the stuffing box the water will be free to escapeatthe top of the stufling box and hence the upward movement of theplunger will stop, but the plunger, while separated from the guidingmeans, is still connected thereto 4by* the yieldingconnecton so that asthe plunger dro s back it will be obliged to reenter thestu ing box,

whereby thel same cannot escape laterally to allow the carto fall. Whenthe plunger is `restored to normal position in the stuffing box the sameagain takes up the guiding mechanism at its lower end and the parts arerestored to proper working condition. Thus liability of accident fromthe above causesis practically eliminated.

The mechanism also aifords a convenient means by which the plunger canbe raised clear of the stuffing box for the purpose of getting at thestuiing box for repairing or adjusting the same.

The mechanism also has the advantage of practically forming a springbuffer for limiting the upward motion ofthe plunger at the lower endthereof.

spective The improvements are shown inl the accompanying drawings,referring to which,

Figure 1 is a sectional elevation of a plunger elevator equipped withthe invention. Fig. 2 is a partial sectional View illustrating theoperation. Fig. 3 is a plan View of the guiding means. Fig. 4 is a per-View of a detail hereinafter described, and Figs. 5 and 6 are viewssimilar to Figs. 1 and 2 illustrating a modification hereinafterreferred to.

Referring to the drawings and in detail, A designates the cylinder, Bthe plunger, and C the car of an ordinary plunger hydraulic elevator.Screwed on the top of the cylin` der A is a flange plater 10 bolted towhich is thestuiiing box. The' stuffing box has an inwardl extendingflange 12 w ich is bored or core out so as to have a hole theretoslightly lar plunger. Fitted into-the top of the stuffing box is afollower plate 13 which is bolted to the top of the stutling box andarranged between which and said flange 12 is a suitable packing plungere l y closed at its upper end and which practically forms a continuationof the plunger.

A guiding mechanism is arranged on the lower end of the plunger. Thisguiding' mechanism preferably is madel non-resilient. The same consistsof a part 16 which has a number, preferably four pairs of extending,ears or lugs 17. Fitted between each pair of lugs is a guiding`wheel orroll 18 which is' journaled on an axle 19 driven into or secured in eachpair of lugs. The wheels 18 are curved on their outer periphery so thatthe same will just clear the inside of the cylinder, as shown in Fig. 3.This formsan efcient guiding-mechanism,

because if the plunger tends to sway or to crowd to one side the properroll or rolls will engage the inside ofv thecylinder and accurately andeasily guideg'rthe lower end.`

of the plunger. Extending up from the part 16 are ears or projections 20which 4come inline to engage the llange 12 of the stuiling box.

lcylinder 15.

ger than the diameter of the 4ing means against the flange. 14. Screwedinto the bottom of the B is a hollow cylinder 15 which is' The guidingmeans is separably and yieldingly attached to the lower end of theplunger Aby the following connections. A plug 21 is screwed in the lowerpart of the hollow cylinder 15. Fitted to pass through the same are aplurality Vof rods 22. Three rods, as shown, may be employed to goodadvantage. 4(ln the top of said rods is fitted a plate 23 and nuts 21are threaded on the ends of said rods 22. Springs 25 are arranged oneach of said rods between said plate 23 and plug 21.k The plate 23 litsfairly closely to the inside of the hollow The lower ends of the rods22'are extended down through holes bored in the part 16 of the guidingmechanism and nuts 26 are screwed on the lower ends of said rods tosecure the guiding mechanismrigidly to said rods.

, The springs 25 are normally adjusted so as to keep the guidingmechanism snugly up against the lower end of the plunger as shown inFig. 1, so that as the plunger runs up and down the lower end thereoflwill be guided in the' manner previously described. If now the plunger,for any reason, should exceed the normal limit -of travel, theprojections 20 will en' upward gage the flange 12 of the Shillingl box,thus detaining the guidingmeans in t e cylinder sov and the continuedupward movement of the plunger will cause Ithe same to separate from theguiding means until the end of the plunger, which is the lowerend of thehollow cylinder 15, escapes from the stuing box and allows a relief ofpressure by the escape of water beneath the lower end of the plungerthrough the stufling box, as shown in Fig. 2. The impact of the guid- 12willbe an easy one owing to the relief afforded by the springs 25 andthe substantial dash pot action which takes v`place. as the -hollowcylinder 15 moves upward-on the plate 23.

When the plunger separates from` the guiding means, as shown inv Fig. 2,it will not be entirely disconnected therefrom as the rods 22 will stillconnect these, arts, whereby the plunger cannot escape. ateally;l andwhereby, when the plunger a ain descends or is allowed to descend,itvwi'l be' properly guided down into the stuffing to again take -upthe'guiding means. The

rods thus lform a reduced yielding separable connection between thelower working end of the plunger andthe guiding means, the lower end laof the plunger practicallycomfprising or containing this peculiarconnection. It will also be noted that the guiding means attached to thelower end of the'` plunger by'this yielding or springer com-V binedspring and dash pot connection ,performs an important function inaddition, in that it will check the upward run of the plunger withavyielding or spring action,

iio

box

instead of at the toplof the elevator well, y

because if the abnormal run isl checked at the upper point the top ofthe car may be broken or the plunger may be buckled as the moving forceisl applied, of course, -at the bot-tom or end of the plunger. Bychecking the upward run 'of the plunger at its lower end withl theyielding action, as previously described, no strain is put upon theentire length of the plunger. y

Figs. 5 and 6 illustrate a modification. In this modification theguiding means before described is connected to the lower end of theplunger B by a piece 27 whichis screwed into the lower end of theplunger and which has ascrew-threaded vend which is extended through ahole lbored in the center of the guiding means and on the end of whichis screwed a nut 28 to secure the guiding means to said piece 27. With'this arrangement,

if the plunger should `exceed its upward limit of travel, the guidingmeans will strike on the flange 12 ofthe stuffing box, but this` blowwill not be a serious oneas by the timethis impact takes place t-heworking end of the plunger B will be clear of the stuiiing box and thewater will be escaping around the reduced shank of the part 2T, as shownin Fig. G. The part 27, ofcourse,

`can be considered or can be made asa reduced or cut-away portion of theplunger B. The details herein shown and described may -be greatly variedby a skilled mechanic wit-hout departing from the scope of my inventionas expressed in the claims.

Having thus fully described my invention what I claim and desire tosecure by Letters Patent is I.' The combination,k with a cylinder,plunger and stuffing box of a hydraulic elevator, of .a guiding meansconnected to the lower end of the plunger and arranged to engage thestuiling box, the connection between t-he guiding means and end of theplunger being constructed to allow the water to escape through thestufiing box when the plunger exceeds its normal upward travel.

2. The combination with a cylinder, plunger a'nd stuiiing box of'ahydraulic elevator, of a guiding meansforl the lower end of the plunger,and a reduced connection between said guiding means and the end of theplunger, whereby escape through the stutling box.

3. The combination with a cylinder, plunger and stuliing box of ahydraulic ele'- A vator, of a guiding means for the lowerend 'of theplunger, the lower en d of the `plungerhaving a reduced connectionto-'the .guiding means.

water is'allowed to .of the langer, rods extending therefromiup'mechanism lconnected with the lower end of the plunger constructed toseparate therefrom in case of an abnormal upward run` 5. The combinationwith a cylinder and plunger of a hydraulic elevator, of a guiding meansyieldingly connected with the lower end of the plunger. i

(5.. The'combination with a cylinder and plunger'of a hydraulicelevator, of'a guiding mechanism connected with the lower end of theplunger with a spring tension. i

'7. The combination' with a cylinder, plunger and stutling box of ahydraulic elevator,` of a guiding mechanism separably connected'with thelower end ot' the plunger, whereby said guiding means can engage thest-ufiing box and the plunger can separate from said guiding means onsaid connection to allow an escape of water.

8. The combination with a cylinder, plunger and stuiing box of ahydraulic ele-v vator, ot' a non-resilientguiding means connected withthe lower end of the plunger constructed to separate therefrom in caseof an abnormal upward run.

9. The combination with a cylinder, plunger and stntling box of ahydraulic elevator, of a guiding means consisting of .a part carrying anumber of journaled wheels or rolls and a separable or yieldingconnection between said guiding mechanism and the lower end of theplunger.

l0. The con'lbination with a cylinder, plunger and stuffing box of ahydraulic ele vator, ot' a guiding mechanism for the lower end of theplunger, and a spring connection between the guiding means and the lowerend of the plungerhoused within the lower end of the plunger.

- 11.y Ther combination with a cylinder, plunger and stu'tliug box of ahydraulic elevator, of a guiding means for the lower end of the plunger7rods extending therefrom up `into the lower end of the plunger, and

springs on said rods to form a yielding connection. f

l2. The combination with `a cylinder, plunger and stul'lingbox of ahydraulic elevator, of a guiding means for the lowerend of the plunger,and a yielding connectionbetween said guidingfmeans and -thelower' endof theplunger having provision for a dash pot action'.

13. The combination with a cylinder,

plunger .and stufling box of a hydraulicrelel Vater, of a 'guiding meansfor' the loweryend.

throng a plug screwed in theend of the plunger, springs on 'said'rods,fand'a plate carried by said rods to forma dash pot.

' '14. The combination'-with a cylinder,

plunger and stuiiing box of a hydraulic eley 'v ator, of a 'hollowlcylinder attached to the .4. The combination with agcylinder and'plunger of 'a hydraulic elevator, of ab guiding" lower end of theplunger vand forming a continuation thereof, a plug screwed 1n the lowerend of said hollow cylinder, a guiding.

means for the lower` end of the plunger, rods-extending from saidguiding means through said plug,4 springs on said rods and a platecarried by said rods. y

15. The comblnation with a cylinder,

plunger andvstufling box of a hydraulic ele-- vator, ofa'guiding meansconnected to the lower end of the plunger by a reduced connection, andlugs on said guiding means ar-v ranged to strike on the under side ofthe stufiing boxto leave communication around said guiding means whenthe working end of the plunger leaves the stuffing box. y

1G. The combination with the cylinder, plunger and stuffing box of ahydraulic elevator, of a stop or buffer depending from plunger andstuffing box of a hydraulic elevator, of a yielding stopping deviceconnected with-the lower end of the plunger by a reduced connection andadapted to arrest the upward travel of the plunger and allow water toescape from the stuling box.

19. vThe combination with a cylinder,

plunger and stalling box of a hydraulic ele-- ,vator, of a guiding meansyieldingly connected with the lower end of the plunger,

wherebyl said guiding means will check the X the plunger with a yieldingupward run o action.'

20. The vcombination with a cylinder,

plunger and stuffing box of a hydraulic elevator, of a guiding meansyieldingly connected by a reduced connection with the lower end of theplunger, whereby said guiding means .will act as a spring butler tolimit the upward movement of the plungerV and the reduced connectionwill allow an escape of water from the top of the stutling box.

21. The combination with a Vertical plun- -ger and a cylinder, of a stopadapted to depend below the lower end of the plunger .when the plungeris in elevated position.

22i The combination with a plunger and cylinder, of a rigid guidingdevice in the cylinder, and resilient means for' connecting the guidingdevice with the plunger.

23. A vertical plunger havin a rigid guiding device resilientlydepending from its lower end. y

24. A plunger having a rigid guiding device yieldingly connectedtherewith.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing witnesses.

THURE LARSSON. lVitnesses:

PHILIP W. SOUTHGATE, Louis W. SOUTHGATE.

